1 Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.5  This is what we refer to as the fish's tail. 6  Anal fins are on the ventral (bottom) surface of the fish, behind the anus. Dorsal fins are found on the back of the fish. 2  There may be up to three of them. 3  The fish uses this fin for balance in the water and sudden movements. 4  Caudal fins are also known as tail fins.
The oxidation number for phosphorus is +3: four covalent bonds with oxygen atoms yield +4 and the central charge yields -1. The oxidation numbers of oxygen and hydrogen are -2â¦ and +1 respectively. The oxidation number of the overall ion is -1.
Oxidation Number Of Phosphorus In PH3. Here is a way to get the answer. If you place a reagent with oxidation number of H = -1 (hydride) it would produce H2. For example: KH+H2O-> KOH + H2. If you place a molecule with oxidation number of H = +1 H2 is NOT formed. NH3+ H2O -> NH4$^+$+ OH$^-$. PH$_3$ doesn't form H2 on contact with water so H is in oxidation state +1 and P is in oxidation state -3. Reaction with strong acids leads to PH$_4^+$ which has similar structure to NH$_4^+$. For these reasons even for As in AsH3 the oxidation state of As = -3.